CVE-2026-19902 (GCVE-0-2026-19902)
Vulnerability from cvelistv5
Published
2026-10-01 07:40
Modified
2026-10-03 15:42
Severity ?
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
The Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the Referer header in all versions up to, and including, 2.8.18 due to insufficient input sanitization and output escaping on the '{search-query}' dynamic tag. When an ad block's code contains that tag, replace_ai_tags() reads $_SERVER['HTTP_REFERER'] and tests it with the regex /[\.\/](google|yahoo|bing|ask)\.[a-z\.]{2,5}[\/]/i. The leading [\.\/] class matches a literal slash, so any referrer merely containing a segment such as '/google.com/' passes as a search-engine referral; the plugin then percent-decodes the referring query with parse_str() and substitutes the resulting 'q' (or 'p') value into the block via preg_replace() with no escaping. This makes it possible for unauthenticated attackers to execute arbitrary JavaScript in the context of the site for any visitor, including a signed-in administrator, by luring them to an attacker-controlled page that frames or links to any ordinary post. Exploitation requires the site to have an ad block whose code uses the '{search-query}' tag with automatic insertion enabled — a documented plugin feature used as intended.
References
Impacted products
Vendor Product Version
spacetime Ad Inserter – Ad Manager & AdSense Ads Version: 0   ≤ 2.8.18
 Create a notification for this product.
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        "metrics": [
          {
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                "id": "CVE-2026-19902",
                "options": [
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                  },
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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-03T15:35:45.406125Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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              "versionType": "semver"
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Yuto Hyakumoto"
        }
      ],
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        }
      ],
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            "version": "3.1"
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              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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              "type": "CWE"
            }
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        "shortName": "Wordfence"
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        },
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          "url": "https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13093"
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        },
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        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3709970%40ad-inserter%2Ftags%2F2.8.19\u0026old=3624916%40ad-inserter%2Ftags%2F2.8.18"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset/3709957/ad-inserter/trunk/ad-inserter.php"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-08-14T19:31:26.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-09-30T19:33:23.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "Ad Inserter \u003c= 2.8.18 - Reflected Cross-Site Scripting via {search-query} Dynamic Tag (Referer Header)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
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    "datePublished": "2026-10-01T07:40:23.197Z",
    "dateReserved": "2026-08-14T19:15:32.388Z",
    "dateUpdated": "2026-10-03T15:42:52.231Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-19902\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-03T15:35:45.406125Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-03T15:41:09.982Z\"}}], \"cna\": {\"title\": \"Ad Inserter \u003c= 2.8.18 - Reflected Cross-Site Scripting via {search-query} Dynamic Tag (Referer Header)\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Yuto Hyakumoto\"}], \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 6.1, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N\"}}], \"affected\": [{\"vendor\": \"spacetime\", \"product\": \"Ad Inserter \\u2013 Ad Manager \u0026 AdSense Ads\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"2.8.18\"}], \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-08-14T19:31:26.000Z\", \"value\": \"Vendor Notified\"}, {\"lang\": \"en\", \"time\": \"2026-09-30T19:33:23.000Z\", \"value\": \"Disclosed\"}], \"references\": [{\"url\": \"https://www.wordfence.com/threat-intel/vulnerabilities/id/5d632cce-40a9-4969-b213-8370ae75287e?source=cve\"}, {\"url\": \"https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13093\"}, {\"url\": \"https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13018\"}, {\"url\": \"https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13022\"}, {\"url\": \"https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13025\"}, {\"url\": \"https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/class.php#L3297\"}, {\"url\": \"https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3709970%40ad-inserter%2Ftags%2F2.8.19\u0026old=3624916%40ad-inserter%2Ftags%2F2.8.18\"}, {\"url\": \"https://plugins.trac.wordpress.org/changeset/3709957/ad-inserter/trunk/ad-inserter.php\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The Ad Inserter \\u2013 Ad Manager \u0026 AdSense Ads plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the Referer header in all versions up to, and including, 2.8.18 due to insufficient input sanitization and output escaping on the \u0027{search-query}\u0027 dynamic tag. When an ad block\u0027s code contains that tag, replace_ai_tags() reads $_SERVER[\u0027HTTP_REFERER\u0027] and tests it with the regex /[\\\\.\\\\/](google|yahoo|bing|ask)\\\\.[a-z\\\\.]{2,5}[\\\\/]/i. The leading [\\\\.\\\\/] class matches a literal slash, so any referrer merely containing a segment such as \u0027/google.com/\u0027 passes as a search-engine referral; the plugin then percent-decodes the referring query with parse_str() and substitutes the resulting \u0027q\u0027 (or \u0027p\u0027) value into the block via preg_replace() with no escaping. This makes it possible for unauthenticated attackers to execute arbitrary JavaScript in the context of the site for any visitor, including a signed-in administrator, by luring them to an attacker-controlled page that frames or links to any ordinary post. Exploitation requires the site to have an ad block whose code uses the \u0027{search-query}\u0027 tag with automatic insertion enabled \\u2014 a documented plugin feature used as intended.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-79\", \"description\": \"CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"b15e7b5b-3da4-40ae-a43c-f7aa60e62599\", \"shortName\": \"Wordfence\", \"dateUpdated\": \"2026-10-01T07:40:23.197Z\"}}}",
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      "dataType": "CVE_RECORD",
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    }
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}


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